Electric thread pair locking device for space load displacement

Abstract

This invention provides an electric threaded locking device for spatial load displacement in the field of spatial locking mechanism technology. It includes a drive assembly, a connector, and a connected component. The drive assembly includes a drive motor and a transmission shaft, with the transmission shaft mounted on the drive motor and rotated by the motor. The connector has a nut base with a first through groove. A locking nut and a nut compression spring are disposed within the first through groove. The locking nut is slidably disposed within the first through groove, and the nut compression spring is positioned between the locking nut and the connector. The connected component has a bolt housing with a locking bolt inside. The locking bolt corresponds to the locking nut and the transmission shaft. The locking bolt engages with the locking nut via the rotation of the transmission shaft, thus pressing the connector against the connected component. This invention achieves reliable locking through a threaded connection, enabling repeated unlocking and locking, ensuring reliable locking of the camera load after on-orbit displacement.

Description

Technical Field

[0001] The invention relates to the technical field of space locking mechanisms, and in particular to an electric thread pair locking device for space load displacement. Background Art

[0002] In order to meet the increasing demand for on-orbit observation, space camera payload technology continues to develop, functional requirements are increasing, and the on-orbit motion process is more complicated. Taking a certain model of satellite payload camera as an example, its weight is about 400kg, and due to the limitation of the carrier envelope size, its launch state and on-orbit working state are inconsistent. After entering orbit, it needs to be reconstructed on-orbit, that is, after entering orbit, it undergoes a series of unlocking, moving, shifting and locking actions under the control of multiple actuating mechanisms from the installed fixed state at launch, and finally forms an on-orbit working state and completes the reconstruction. In order to ensure that the camera has sufficient rigidity and stability after displacement, the axial locking force of a single locking point needs to reach 30kN, and its locking mechanism must play a reliable locking function, which is also a key technology to achieve camera reconstruction.

[0003] At present, the on-orbit locking mechanisms used at home and abroad, such as the spring pin type repeated locking and releasing mechanism and the cable type repeated locking and releasing mechanism for locking and releasing solar wings, generally use positioning pins to achieve positioning, which makes it difficult to effectively control and achieve a large locking force. Although the locking mechanism using memory alloy or elastic memory composite material eliminates the driving components such as motors, the locking accuracy needs to be further verified.

[0004] Through prior art search, it is found that the Chinese utility model patent announcement number is CN201159787Y, which discloses a precision locking device for a large-aperture deployable primary mirror of a space observation optical remote sensor, including a positioning device and a locking device. The positioning device is composed of a group of positioning blocks that limit three degrees of freedom, a group of positioning blocks that limit two degrees of freedom, and a group of positioning blocks that limit one degree of freedom; each group of positioning blocks is composed of a mother positioning block fixed on the support structure of the intermediate mirror of the primary mirror and a sub-positioning block fixed on the support structure of the segmented mirror of the primary mirror. The locking device is composed of a fixed spring nut, a front base, a spring, a locking nut, a rear base, a thrust bearing, a locking bolt, a reducer and a stepper motor. However, the above patent has the following shortcomings: due to the limitations of the relative motion form of the threaded pair and the interference problem of the clamping surface, it is also impossible to meet the locking requirements under specific conditions. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide an electric thread pair locking device for spatial load displacement.

[0006] According to the present invention, an electric thread pair locking device for space load displacement includes a driving assembly, a connecting member and a connected member;

[0007] The driving assembly includes a driving motor and a transmission shaft, wherein the transmission shaft is arranged on the driving motor and the transmission shaft is driven by the driving motor to rotate;

[0008] The connecting member is provided with a nut base, the nut base is provided with a first through slot, a locking nut and a nut pressing spring are arranged in the first through slot, the locking nut is slidably arranged in the first through slot, and the nut pressing spring is arranged between the locking nut and the connecting member;

[0009] The connected member is provided with a bolt housing, a locking bolt is provided in the bolt housing, one end of the locking bolt is provided corresponding to the locking nut, and the other end of the locking bolt is provided corresponding to the transmission shaft;

[0010] The locking bolt is engaged with the locking nut through the rotation of the transmission shaft, and the connecting member is pressed against the connected member.

[0011] In some embodiments, the drive assembly further includes a harmonic reducer and a reducer housing, the harmonic reducer is connected to the drive motor, the reducer housing is sleeved on the harmonic reducer, the transmission shaft is connected to the harmonic reducer, and the other end of the transmission shaft passes through the reducer housing.

[0012] In some embodiments, the driving assembly further includes a deep groove ball bearing, the deep groove ball bearing is disposed in the reducer housing, and the deep groove ball bearing is sleeved on the transmission shaft.

[0013] In some embodiments, the harmonic reducer includes a rigid wheel, a flexible wheel and a wave generator, the rigid wheel is matched with the flexible wheel, the drive motor is provided with a flange, the rigid wheel is matched with the flange and the reducer housing by a hole-shaft, the wave generator is fixedly arranged on the output shaft of the drive motor, and the flexible wheel is fixedly arranged with the transmission shaft.

[0014] In some embodiments, a second through slot is provided on the bolt housing, a locking bolt and a bolt clamping nut are provided in the second through slot, the locking bolt is slidably provided in the second through slot, and the bolt clamping nut is provided between the locking bolt and the bolt housing.

[0015] In some embodiments, the top of the locking bolt has an external thread, the bottom of the locking bolt is provided with a square hole, the bottom of the locking bolt is an outer spherical surface, the reducer housing is provided with an inner spherical surface, and the locking bolt is contacted with the reducer housing through the cooperation between the outer spherical surface and the inner spherical surface.

[0016] In some embodiments, the nut base includes a pressing surface, the nut base is arranged in contact with the bolt housing through the pressing surface, and the nut base is arranged with four boss structures.

[0017] In some embodiments, the locking nut adopts a hexagonal boss, and the nut base is provided with a hexagonal hole. The locking nut is arranged in the nut base through the cooperation between the hexagonal boss and the hexagonal hole.

[0018] In some embodiments, the drive motor is energized, and the output shaft of the drive motor drives the wave generator to rotate. After the drive motor is decelerated, it drives the flexible wheel and the transmission shaft to rotate, and then drives the locking bolt to rotate; the locking bolt continues to rotate, and the locking nut moves downward by 2 mm under the action of the threaded pair until it fits with the inner end surface of the threaded base, and the locking nut cannot move further, and the locking bolt starts to move upward until the step surface of the locking bolt fits with the inner end surface of the bolt housing; the drive motor continues to be energized, and the step surface of the locking bolt is already in contact with the bolt housing. Under the action of the drive motor, the locking bolt starts to generate a tightening torque, and as the locking bolt rotates until the required torque requirement is reached, the drive motor is powered off to complete the locking.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention provides a connecting member and a connected member. The connecting member is combined with a nut base, a locking nut, and a nut compression spring. The connected member is combined with a locking bolt, a bolt compression spring, and a bolt housing. The locking mechanism is small in size and has low parts processing difficulty. Reliable locking is achieved by threaded connection, and the device can be used multiple times to achieve repeated unlocking and locking.

[0021] 2. The present invention provides a nut compression spring, and the nut compression spring meshes with the locking nut under the pressure of the nut compression spring, so that the bolt rises slowly and gradually compresses the connecting part and the connected part, and finally achieves the required tightening torque through motor control, so that the camera load can be reliably locked after the on-track displacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 It is a cross-sectional schematic diagram of the electric thread pair locking device for spatial load displacement of the present invention in the initial state;

[0024] Figure 2 It is a cross-sectional schematic diagram of the electric thread pair locking device for spatial load displacement of the present invention in a locked state;

[0025] Figure 3 is a cross-sectional schematic diagram of a drive assembly of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the locking bolt of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the locking nut of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the nut base of the present invention;

[0029] Reference numerals:

[0030]

[0031] DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0033] like Figure 1 The figure shows a cross-sectional schematic diagram of the electric thread pair locking device for space load displacement in the initial state. Figure 2 The figure shows a cross-sectional schematic diagram of the electric thread pair locking device for space load displacement in a locked state, including a driving assembly 1, a connecting member 2, and a connected member 3. The connecting member 2 is provided with a nut base 9, the nut base 9 is provided with a first through slot, a locking nut 5 and a nut pressing spring 7 are provided in the first through slot, the locking nut 5 is slidably arranged in the first through slot, and the nut pressing spring 7 is arranged between the locking nut 5 and the connecting member 2.

[0034] A bolt housing 8 is provided on the connected part 3, a locking bolt 4 is provided in the bolt housing 8, one end of the locking bolt 4 is provided corresponding to the locking nut 5, and the other end of the locking bolt 4 is provided corresponding to the transmission shaft 14. A second through groove is provided on the bolt housing 8, a locking bolt 4 and a bolt clamping nut are provided in the second through groove, the locking bolt 4 is slidably provided in the second through groove, the bolt clamping nut is provided between the locking bolt 4 and the bolt housing 8, and the locking nut 5 is pressed against the inner end surface of the nut base 9 by the nut clamping spring 7 to provide an axial force in the initial meshing process of the thread to ensure that the thread enters the meshing state. The locking bolt 4 is arranged to mesh with the locking nut 5 through the rotation of the transmission shaft 14, and the connecting part 2 is pressed against the connected part 3.

[0035] like Figure 3The figure shows a cross-sectional schematic diagram of the drive assembly 1, which includes a drive motor 11, a transmission shaft 14, a harmonic reducer 12, a reducer housing 13 and a deep groove ball bearing 15. The transmission shaft 14 is arranged on the drive motor 11, and the transmission shaft 14 is rotated by the drive motor 11. The harmonic reducer 12 is connected to the drive motor 11, the reducer housing 13 is sleeved on the harmonic reducer 12, the transmission shaft 14 is connected to the harmonic reducer 12, and the other end of the transmission shaft 14 passes through the reducer housing 13. The deep groove ball bearing 15 is arranged in the reducer housing 13, and the deep groove ball bearing 15 is sleeved on the transmission shaft 14.

[0036] The harmonic reducer 12 includes a rigid wheel 121, a flexible wheel 123 and a wave generator 122. The rigid wheel 121 and the flexible wheel 123 are matched with each other. A flange is provided on the drive motor 11. The rigid wheel 121 is matched with the flange and the reducer housing 13 by a hole-shaft. The wave generator 122 is fixedly arranged on the output shaft of the drive motor 11, and the flexible wheel 123 is fixedly arranged on the transmission shaft 14.

[0037] like Figure 4 The structure diagram of the locking bolt 4 is shown as follows. Figure 5 The structure diagram of the locking nut 5 is shown as follows. Figure 6 The structure diagram of the nut base 9 is shown. The top of the locking bolt 4 has an external thread, and the bottom of the locking bolt 4 is provided with a square hole to achieve torque transmission. The locking bolt 4 can slide along the transmission shaft 14 and can tolerate a large coaxial error. The bottom of the locking bolt 4 is an outer spherical surface, and the reducer housing 13 is provided with an inner spherical surface. The locking bolt 4 is contacted with the reducer housing 13 through the cooperation between the outer spherical surface and the inner spherical surface to adapt to the tilt error of the locking bolt 4. The locking nut 5 is pressed by the nut pressing spring 7. When it is not lifted by the locking bolt 4, the locking nut 5 protrudes from the pressing surface by about 4mm and is connected to the receiving groove provided with the protruding part of the locking nut 5. Solid MoS2 lubrication and cold-proof welding are used between the sliding surfaces of the locking mechanism.

[0038] The nut base 9 includes a pressing surface, and the nut base 9 is arranged in contact with the bolt housing 8 through the pressing surface. The nut base 9 adopts a four-way boss structure to expand the support area and improve the connection rigidity. The locking nut 5 adopts a hexagonal boss, and the nut base 9 is provided with a hexagonal hole. The locking nut 5 is arranged in the nut base 9 through the cooperation between the hexagonal boss and the hexagonal hole to limit the rotation of the locking nut 5 during the threaded engagement process.

[0039] When in use, use no less than 3 sets of locking mechanisms, and the tightening process is uniform, symmetrical, and the tightening torque is applied in steps. Working principle: In the initial state, the locking bolt 4 and the locking bolt 4 have moved to a coaxial state, and the connecting part 2 together with the nut base 9, the locking nut 5, and the nut compression spring 7 have been moved toward the connected part 3 under the action of other displacement mechanisms until the connection surface fits, and the locking nut 5 and the nut compression spring 7 are pushed by the locking bolt 4 and moved up about 2mm. Since the locking bolt 4 and the locking nut 5 are both chamfered, the chamfer of the locking bolt 4 pushes into the chamfer of the locking nut 5, and the internal and external threads are in a semi-engaged or non-engaged state.

[0040] The drive motor 11 is powered on, and the output shaft of the drive motor 11 drives the wave generator 122 to rotate. After the drive motor 11 is decelerated, it drives the flexible wheel 123 and the transmission shaft 14 to rotate, and then drives the locking bolt 4 to rotate. Since the locking nut 5 is restricted in rotational freedom by the hexagonal hole at this time, and is subjected to the pressure of the nut compression spring 7, the external thread at the top of the locking bolt 4 will be fully engaged with the internal thread of the nut from a semi-engaged or non-engaged state after the locking bolt 4 rotates through a certain angle. The locking bolt 4 continues to rotate, and the locking nut 5 moves downward by 2mm under the action of the thread pair until it fits with the inner end face of the thread base. The locking nut 5 cannot move further, and the locking bolt 4 starts to move upward until the step surface of the locking bolt 4 fits tightly with the inner end face of the bolt housing 8; the drive motor 11 continues to be powered on, and the step surface of the locking bolt 4 fits with the bolt housing 8. Under the action of the motor, the locking bolt 4 begins to generate a tightening torque, and as the bolt rotates, the torque gradually increases. By controlling the pulse frequency or current until the required torque requirement is reached, the motor is powered off and the locking is completed.

[0041] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An electric thread pair locking device for spatial load displacement, characterized in that: It comprises a driving component (1), a connecting component (2) and a connected component (3); The driving assembly (1) comprises a driving motor (11) and a transmission shaft (14); the transmission shaft (14) is arranged on the driving motor (11), and the transmission shaft (14) is driven by the driving motor (11) to rotate; The connecting member (2) is provided with a nut base (9), the nut base (9) is provided with a first through slot, a locking nut (5) and a nut pressing spring (7) are arranged in the first through slot, the locking nut (5) is slidably arranged in the first through slot, and the nut pressing spring (7) is arranged between the locking nut (5) and the connecting member (2); The connected member (3) is provided with a bolt housing (8), a locking bolt (4) and a bolt compression spring (6) are provided in the bolt housing (8), one end of the locking bolt (4) is provided corresponding to the locking nut (5), the other end of the locking bolt (4) is provided corresponding to the transmission shaft (14), and the bolt compression spring (6) is provided between the locking bolt (4) and a step surface provided at one end of the bolt housing (8) close to the connecting member (2); The locking bolt (4) is rotated by the transmission shaft (14) to engage with the locking nut (5), and the connecting member (2) and the connected member (3) are pressed together; The drive assembly (1) further comprises a harmonic reducer (12) and a reducer housing (13); the harmonic reducer (12) is connected to the drive motor (11); the reducer housing (13) is sleeved on the harmonic reducer (12); the transmission shaft (14) is connected to the harmonic reducer (12); and the other end of the transmission shaft (14) passes through the reducer housing (13); The harmonic reducer (12) comprises a rigid wheel (121), a flexible wheel (123) and a wave generator (122); the rigid wheel (121) and the flexible wheel (123) are arranged in cooperation with each other; a flange is provided on the drive motor (11); the rigid wheel (121) and the flange and the reducer housing (13) are arranged in cooperation with each other by using a hole and a shaft; the wave generator (122) is fixedly arranged on the output shaft of the drive motor (11); and the flexible wheel (123) and the transmission shaft (14) are fixedly arranged; The drive motor (11) is powered on, and the output shaft of the drive motor (11) drives the wave generator (122) to rotate. After the drive motor (11) is decelerated, it drives the flexible wheel (123) and the transmission shaft (14) to rotate, and then drives the locking bolt (4) to rotate; the locking bolt (4) continues to rotate, and the locking nut (5) moves downward by 2 mm under the action of the thread pair until it fits with the inner end surface of the nut base (9), and the locking nut (5) cannot move further, and the locking bolt (4) starts to move upward until the step surface of the locking bolt (4) fits with the inner end surface of the bolt housing (8); the drive motor (11) continues to be powered on, and the step surface of the locking bolt (4) fits with the bolt housing (8). Under the action of the drive motor (11), the locking bolt (4) starts to generate a tightening torque, and as the locking bolt (4) rotates until the required torque requirement is reached, the drive motor (11) is powered off to complete the locking.

2. The electric thread pair locking device for spatial load displacement according to claim 1 is characterized in that: The driving assembly (1) further comprises a deep groove ball bearing (15), wherein the deep groove ball bearing (15) is arranged in the reducer housing (13), and the deep groove ball bearing (15) is sleeved on the transmission shaft (14).

3. The electric thread pair locking device for spatial load displacement according to claim 1, characterized in that: The top of the locking bolt (4) is provided with an external thread, the bottom of the locking bolt (4) is provided with a square hole, the bottom of the locking bolt (4) is an outer spherical surface, an inner spherical surface is provided inside the reducer housing (13), and the locking bolt (4) is arranged in contact with the reducer housing (13) through the mutual cooperation between the outer spherical surface and the inner spherical surface.

4. The electric thread pair locking device for spatial load displacement according to claim 1, characterized in that: The nut base (9) comprises a pressing surface, and the nut base (9) is arranged in contact with the bolt housing (8) via the pressing surface. The nut base (9) is arranged with a boss structure at four locations.

5. The electric thread pair locking device for spatial load displacement according to claim 4, characterized in that: The locking nut (5) adopts a hexagonal boss, and the nut base (9) is provided with a hexagonal hole. The locking nut (5) is arranged in the nut base (9) through the cooperation between the hexagonal boss and the hexagonal hole.

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